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McQuay OM 751 7
Getting Started
Getting Started
The MicroTech II Unit Vent Controller (UVC) is a self-contained device that is capable of
complete, stand-alone operation. Information in the controller can be displayed and modified
by using the keypad/display (local user interface). The following sections describe how to use
the keypad/display.
Note – Many UVC parameters are accessible both through the keypad/display and the network
interface. The shared keypad/display and the network interface variables have a “last-
change-wins” relationship.
Using the Keypad/Display
The keypad/display shown in Figure 1 is provided with all MicroTech II Applied Unit
Ventilator unit controllers. With the keypad/display, operating conditions, system alarms, and
control parameters can be monitored. Set points and other parameters also can be modified.
Figure 1: Keypad/display
Display Format
The keypad/display’s 2-digit, 7-segment display normally shows the effective heating or
cooling temperature set point (Effective Set Point Output). The display also is used to view
and modify UVC parameters as explained in the following sections.
Note – When the UVC is in the OFF mode, the effective heating set point appears in the display.
All other LEDs are switched off.
Keypad Functions
Security Levels
The keypad/display provides a 4-level password security feature that can be used to restrict
access. The available security levels are shown in Table 6.
Note – All unit ventilator controllers ship with the lowest security (level 0) enabled. To change
security levels, see Figure 2. Once a security level is changed, the keypad/display
remains at that security level until the next time it is changed.
Why can’t I use the MODE or FAN key or adjust Set Point Offset?
Most likely this is due to the security feature being used. If the security feature is set higher
than level 0, then some keypad/display functionality is locked out. To ensure this is not the
problem, enter the level 0 password then try to use the keypad/display again.
HIGH
MED
AUTO
LOW
FAN ONLY
COOL
AUTO
HEAT
MODE FAN
ON /
STOP
FUNC
MicroTech
TM
II